Is AI programming useful in everyday programs?
Yes, but probably only to a limited degree in the near term.

Where people draw the boundaries around 'artificial intelligence' is fuzzy, but if one takes the broad view, where it incorporates any sort of coding of explicitly cognitive functions, then many routine economic tasks can benefit from artificial intelligence. Many search engines, for example, can be seen as offering artificial intelligence applications as a service.

For more 'standard' applications, most near-team applications of AI have to deal with fraud detection and prevention. If you track a user's cursor moving across the screen, for example, you can build a model that differentiates between humans and bots, and treat the two separately. See this article for an example.

In the longer term, of course, a program that could write programs could write these sort of applications like any other.